gem 安装 mysql ...错误

Question

安装 MySQL gem：

  $ export ARCHFLAGS="-arch i386 -arch x86_64"
  $ gem install mysql -- --with-mysql-config=/usr/local/bin/mysql_config

返回错误：

  ERROR:  While executing gem ... (NoMethodError)
  undefined method `spec' for nil:NilClass

我该如何修复它？

信息：

  $ brew list
  git       
  mysql     
  readline

  $ gem env
  RubyGems Environment:
  - RUBYGEMS VERSION: 1.3.7
  - RUBY VERSION: 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]
  - INSTALLATION DIRECTORY: /Library/Ruby/Gems/1.8
  - RUBY EXECUTABLE: /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby
  - EXECUTABLE DIRECTORY: /usr/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - universal-darwin-10
  - GEM PATHS:
     - /Library/Ruby/Gems/1.8
     - /Users/horace/.gem/ruby/1.8
     - /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/gems/1.8
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
     - "gem" => "--no-ri --no-rdoc"
  - REMOTE SOURCES:
     - http://rubygems.org/

  $ which mysql
  /usr/local/bin/mysql

  $ gem list
  *** LOCAL GEMS ***
  brewbygems (0.3.1)
  sqlite3-ruby (1.3.2)

谢谢！

编辑：

dtruss 的输出： http://clomputing.com/temp/dtruss-gem -安装-mysql.txt

Answer 1

对于 Ubuntu (Maverick)，需要安装它

sudo apt-get install libmysqlclient-dev

，然后运行

sudo gem install mysql

其他发行版，首先

sudo apt-get install libmysqlclient-dev

检查 mysql_config 的位置 http:// packages.ubuntu.com/

并运行

sudo gem install mysql --with-mysql-config=path/to/mysql_config

Answer 2

也许尝试用 strace 运行它，看看问题是什么？

strace gem install mysql --with-mysql-config=/usr/local/bin/mysql_config

或者如果您使用的是 Mac OS X
dtruss gem install mysql --with-mysql-config=/usr/local/bin/mysql_config